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A study of photon production in hadronic events frome + e − annihilation

Zeitschrift für Physik C Particles and Fields volume 46, pages 1–7 (1990)Cite this article

Abstract

Results are presented on an investigation of photons produced in multihadronic final states frome + e − annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, ofA=−0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.

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Author notes

  1. D. D. Pitzl

    Present address: , Santa Cruz, Cal., USA

  2. K. Ambrus

    Present address: MBB, München, FRG

  3. S. L. Cartwright

    Present address: Sheffield University, UK

  4. K. H. Hellenbrand

    Present address: Universität des Saarlandes, Saarbrücken, FRG

  5. H. Kado

    Present address: Bayer Ag, Brunsbüttel, FRG

  6. S. Komamiya

    Present address: SLAC, Cal., USA

  7. M. Kuhlen

    Present address: CALTECH, Cal., USA

  8. N. Magnussen & D. Schmidt

    Present address: Universität-Gesamthochschule Wuppertal, Wuppertal, FRG

  9. J. A. J. Skard

    Present address: ST Systems Corporation, Lanham, MD, USA

  10. P. Spitzer

    Present address: MPI, Heidelberg, FRG

  11. P. Hill

    Present address: DESY, Hamburg, FRG

  12. J. Hagemann & C. Kleinwort

    Present address: CERN, Geneva, Switzerland

  13. U. Schneekloth

    Present address: MIT, Boston, USA

Authors and Affiliations

  1. Deutsches Elektronen-Synchrotron DESY, Hamburg, Federal Republic of Germany

    W. Bartel, R. Felst, D. Haidt, H. Kado, G. Knies, H. Krehbiel, N. Magnussen, R. Meinke, B. Naroska, J. Olsson, R. Ramcke, D. Schmidt & P. Steffen

  2. II. Institut für Experimentalphysik der Universität Hamburg, Hamburg, Federal Republic of Germany

    D. D. Pitzl, T. Greenshaw, J. Hagemann, G. Heinzelmann, C. Kleinwort, M. Kuhlen, F. Ould-Saada, U. Schneekloth & G. Weber

  3. Physikalisches Institut der Universität Heidelberg, Heidelberg, Federal Republic of Germany

    K. Ambrus, S. Bethke, A. Dieckmann, G. Eckerlin, E. Elsen, J. Heintze, K. H. Hellenbrand, S. Komamiya, J. v. Krogh, H. Rieseberg, L. Smolik, P. Spitzer, A. Wagner & M. Zimmer

  4. University of Lancaster, Lancaster, England

    C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes, J. M. Nye & I. W. Walker

  5. University of Manchester, Manchester, England

    J. Allison, R. J. Barlow, J. Chrin, I. P. Duerdoth, F. K. Loebinger, A. A. Macbeth, P. G. Murphy & K. Stephens

  6. University of Maryland, College Park, MD, USA

    P. Hill, J. A. J. Skard & G. T. Zorn

  7. Rutherford Appleton Laboratory, Chilton, Didcot, England

    S. L. Cartwright, D. Clarke, R. Marshall & R. P. Middleton

  8. Insternational Center for Elementary Particle Physics, University of Tokyo, Tokyo, Japan

    K. Kawagoe, T. Kobayashi & H. Minowa

Authors
  1. D. D. Pitzl
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  2. J. Allison
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  3. K. Ambrus
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  4. R. J. Barlow
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  5. W. Bartel
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  6. S. Bethke
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  7. C. K. Bowdery
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  8. S. L. Cartwright
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  9. J. Chrin
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  10. D. Clarke
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  11. A. Dieckmann
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  12. I. P. Duerdoth
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  13. G. Eckerlin
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  14. E. Elsen
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  15. R. Felst
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  16. A. J. Finch
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  17. F. Foster
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  18. T. Greenshaw
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  19. J. Hagemann
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  20. D. Haidt
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  21. J. Heintze
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  22. G. Heinzelmann
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  23. K. H. Hellenbrand
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  24. P. Hill
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  25. G. Hughes
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  26. H. Kado
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  27. K. Kawagoe
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  28. C. Kleinwort
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  29. G. Knies
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  30. T. Kobayashi
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  31. S. Komamiya
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  32. H. Krehbiel
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  33. J. v. Krogh
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  34. M. Kuhlen
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  35. F. K. Loebinger
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  36. A. A. Macbeth
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  37. N. Magnussen
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  38. R. Marshall
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  39. R. Meinke
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  40. R. P. Middleton
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  41. H. Minowa
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  42. P. G. Murphy
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  43. B. Naroska
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  44. J. M. Nye
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  45. J. Olsson
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  46. F. Ould-Saada
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  47. R. Ramcke
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  48. H. Rieseberg
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  49. D. Schmidt
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  50. L. Smolik
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  51. U. Schneekloth
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  52. J. A. J. Skard
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  53. P. Spitzer
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  54. P. Steffen
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  55. K. Stephens
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  56. A. Wagner
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  57. I. W. Walker
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  58. G. Weber
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  59. M. Zimmer
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  60. G. T. Zorn
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JADE Collaboration., Pitzl, D.D., Allison, J. et al. A study of photon production in hadronic events frome + e − annihilation. Z. Phys. C - Particles and Fields 46, 1–7 (1990). https://doi.org/10.1007/BF02440827

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  • DOI: https://doi.org/10.1007/BF02440827

Keywords

  • Charge Asymmetry
  • Charged Pion
  • Initial State Radiation
  • Hadronic Event
  • Quark Charge